Science : Ch 11 – The Human Eye and the Colourful World

A clear sky appears blue, because:

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:

The sun appears red at sunset or sunrise. Choose the incorrect statement from the following

Arjun remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed ,Name two observations which can be explained by the above phenomenon.

Power of a lens is

Light which consists of only one colour or single wavelength is called Monochromatic

The sky appears black to an astronaut

The effect seen Color of the sky during Sunrise and Sunset

The density of the atmosphere, as we know goes on decreasing as the distance above the sea level increases,this phenomeneon is called

The defect in a person can see nearby objects but not far away objects

Myopia can be corrected by using

Astigmatism can be corrected

Rainbow is caused due to

The colour of scattered light depends on the

The sky appears black to an astronaut as there is no